<template>
  <div class="app-container">
    <h2 style="text-align: center;">发布新课程</h2>
    <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
      <el-step title="填写课程基本信息"/>
      <el-step title="创建课程大纲"/>
      <el-step title="提交审核"/>
    </el-steps>
    <el-button type="text" @click="openChapterDialog">添加章节</el-button>
    <!-- 章节 -->
    <ul>
      <li
        v-for="chapter in chapterNestedList"
        :key="chapter.id">
        <p>
            {{ chapter.title }}
            <span class="acts">
                <el-button type="text" @click="addVideo(chapter.id)">添加课时</el-button>
                <el-button type="text" @click="editChapter(chapter.id)">编辑</el-button>
                <el-button type="text" @click="removeChapter(chapter.id)">删除</el-button>
            </span>
        </p>
        <!-- 视频 -->
        <ul>
            <li
                v-for="video in chapter.children"
                :key="video.id">
                <p>{{ video.title }}
                    <span class="acts">
                        <el-button type="text" @click="findVideoInfo(video.id)">编辑</el-button>
                        <el-button type="text" @click="removeVideo(video.id)">删除</el-button>
                    </span>
                </p>
            </li>
        </ul>
      </li>
      </ul>
    <el-form label-width="120px">
      <el-form-item>
        <el-button @click="previous">上一步</el-button>
        <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
      </el-form-item>
    </el-form>

    <!-- 添加和修改章节表单 -->
    <el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
      <el-form :model="chapter" label-width="120px">
          <el-form-item label="章节标题">
              <el-input v-model="chapter.title"/>
          </el-form-item>
          <el-form-item label="章节排序">
              <el-input-number v-model="chapter.sort" :min="0" controls-position="right"/>
          </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
          <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
          <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
      </div>
    </el-dialog>
    <!-- 添加和修改课时表单 -->
    <el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
      <el-form :model="video" label-width="120px">
        <el-form-item label="课时标题">
          <el-input v-model="video.title"/>
        </el-form-item>
        <el-form-item label="课时排序">
          <el-input-number v-model="video.sort" :min="0" controls-position="right"/>
        </el-form-item>
        <el-form-item label="是否免费">
          <el-radio-group v-model="video.free">
            <el-radio :label="true">免费</el-radio>
            <el-radio :label="false">默认</el-radio>
          </el-radio-group>
        </el-form-item>
    <!-- 上传视频组件 -->
    <el-form-item label="上传视频">
      <el-upload
            :on-success="handleVodUploadSuccess"
            :on-remove="handleVodRemove"
            :before-remove="beforeVodRemove"
            :on-exceed="handleUploadExceed"
            :file-list="fileList"
            :action="BASE_API+'/eduvod/video/uploadVideo'"
            :limit="1"
            class="upload-demo">
      <el-button size="small" type="primary">上传视频</el-button>
      <el-tooltip placement="right-end">
          <div slot="content">最大支持1G，<br>
              支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
              GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
              MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
              SWF、TS、VOB、WMV、WEBM 等视频格式上传</div>
          <i class="el-icon-question"/>
      </el-tooltip>
    </el-upload>
</el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
        <el-button :disabled="saveVideoBtnDisabled" type="primary" @click="saveOrUpdateVideo">{{updataOrSave}}</el-button>
      </div>
    </el-dialog>
  </div>
</template>
<script>
import chapter from "@/api/chapter/chapter"
import video from "@/api/chapter/video"
export default {
    data(){
        return {
            BASE_API : process.env.BASE_API, 
            saveBtnDisabled : false,
            chapterNestedList :[],
            fileList:[],
            courseId:"",
            dialogChapterFormVisible:false,
            dialogVideoFormVisible:false,
            saveVideoBtnDisabled:false,
            chapter:{              
              title: '',
              sort: 0
            },
            video:{
              videoSourceId :"",
              videoOriginalName : ""
            },
            updataOrSave : "确定"
        }
    },
    created(){
        this.init()
    },
    methods:{
        // =================================视频上传====================================
        handleUploadExceed(){
          this.$message.error("删除后才能添加")
        },
        handleVodUploadSuccess(res,file,fileList){
          console.log(res)
          this.video.videoSourceId = res.data.id
          console.log(this.video.videoSourceId)
          this.video.videoOriginalName = file.name
        },
        handleVodRemove(){
          video.deleteVideoById(this.video.videoSourceId)
          .then(res =>{
              this.$message.success("删除成功")
              this.video.videoSourceId = ""
              this.video.videoOriginalName = ""
              this.fileList = []
          })
        },
        beforeVodRemove(file,fileList){
          this.$confirm(`确定删除${file.name}?`)
        },
        // =================================添加小节====================================
        findVideoInfo(id){
          this.updataOrSave = "确认修改"
          this.dialogVideoFormVisible = true
          video.findVideoInfo(id)
          .then(res =>{
            this.video = res.data.video
          })
        },
        addVideo(id){
          this.video = {}
          this.video.chapterId = id
          this.video.courseId = this.courseId
          this.dialogVideoFormVisible = true
        },
        saveOrUpdateVideo(){
          if(!this.video.id){
            video.addVideo(this.video)
            .then(res =>{
              // 关弹框
              this.dialogVideoFormVisible = false
              // 提升
              this.$message.success('添加小节成功')
              // 刷新页面
              this.init()
          })
          }else{
            video.updateVideoInfo(this.video)
            .then(res =>{
              // 关弹框
              this.dialogVideoFormVisible = false
              // 提升
              this.$message.success('修改小节成功')
              // 刷新页面
              this.init()
            })
          }
        },
        removeVideo(videID){
          this.$confirm('此操作将永久删除该记录, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
          }).then(() => {
            return video.removeVideo(videID)
          }).then(() => {
            this.init()// 刷新列表
            this.$message({
              type: 'success',
              message: '删除小节成功!'
            })
          }).catch((response) => { // 失败
            if (response === 'cancel') {
              this.$message({
                type: 'info',
                message: '已取消删除'
              })
            } else {
              this.$message({
                type: 'error',
                message: response.message
              })
            }
          })
        },
        //  保存或者修改章节内容 
        saveOrUpdate(){
          if(!this.chapter.id){
            this.addChapter()
          }else{
            this.updateChapter()
          }
        },
        next(){
            this.$router.push({path:'/course/publish/'+this.courseId})
        },
        previous(){
            this.$router.push({path:'/course/info/'+this.courseId})
        },
        //  页面初始话
        init() {
          if(this.$route.params && this.$route.params.id){
            this.courseId = this.$route.params.id
            this.chapter.courseId = this.courseId
            // 根据ID 获得章节信息
            this.getAllChapterVideo()
          }
        },
        // 获得章节的小视频
        getAllChapterVideo(){
            chapter.getAllChapterVideo(this.courseId)
            .then(res =>{
              this.chapterNestedList = res.data.list
              
            })
        },
        // 弹出添加框
        openChapterDialog(){
          this.dialogChapterFormVisible = true
          this.chapter.title = ''
          this.chapter.sort = ''
        },
        // 添加章节
        addChapter(){
          chapter.addChapterInfo(this.chapter)
          .then(res =>{
            // 关弹框
            this.dialogChapterFormVisible = false
            // 提升
            this.$message.success('添加章节成功')
            // 刷新页面
            this.init()
          })
        },
        editChapter(chapterId){
          this.dialogChapterFormVisible = true
          chapter.findChapterInfo(chapterId)
          .then(res =>{
            this.chapter = res.data.chapter
          })
        },
        // 修改章节
        updateChapter(){
          chapter.updateChapterInfo(this.chapter,this.chapter.id)
          .then(res=>{
            // 关弹框
            this.dialogChapterFormVisible = false
            // 提升
            this.$message.success('修改章节成功')
            // 刷新页面
            this.init()
          })
        },
        removeChapter(chapterId) {
          this.$confirm('此操作将永久删除该记录, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
          }).then(() => {
            return chapter.deleteChapterInfo(chapterId)
          }).then(() => {
            this.init()// 刷新列表
            this.$message({
              type: 'success',
              message: '删除成功!'
            })
          }).catch((response) => { // 失败
            if (response === 'cancel') {
              this.$message({
                type: 'info',
                message: '已取消删除'
              })
            } else {
              this.$message({
                type: 'error',
                message: response.message
              })
            }
          })
        },
    }
}
</script>
<style scoped>
.chanpterList{
    position: relative;
    list-style: none;
    margin: 0;
    padding: 0;
}
.chanpterList li{
  position: relative;
}
.chanpterList p{
  float: left;
  font-size: 20px;
  margin: 10px 0;
  padding: 10px;
  height: 70px;
  line-height: 50px;
  width: 100%;
  border: 0px solid #DDD;
}
.chanpterList .acts {
    float: right;
    font-size: 14px;
}
.videoList{
  padding-left: 50px;
}
.videoList p{
  float: left;
  font-size: 14px;
  margin: 10px 0;
  padding: 10px;
  height: 50px;
  line-height: 30px;
  width: 100%;
  border: 0px dotted #DDD;
}
</style>